CN116068395A - Parameter testing method of linear induction motor in static state - Google Patents

Parameter testing method of linear induction motor in static state Download PDF

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CN116068395A
CN116068395A CN202310206436.5A CN202310206436A CN116068395A CN 116068395 A CN116068395 A CN 116068395A CN 202310206436 A CN202310206436 A CN 202310206436A CN 116068395 A CN116068395 A CN 116068395A
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motor
excitation
reactance
primary
steps
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CN116068395B (en
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曾迪晖
王珂
葛琼璇
赵鲁
张波
杨培
朱进权
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Institute of Electrical Engineering of CAS
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity

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Abstract

The invention discloses a parameter testing method of a linear induction motor in a static state, wherein a motor rotor is in the static state, and the method is suitable for a short primary linear induction motor and a long primary linear induction motor. Firstly, taking out an induction plate of a motor secondary, applying alternating current with preset voltage and frequency to an input end of a motor primary winding, and obtaining a current effective value, apparent power and active power of the input end of the motor. And then, restoring the structure of the secondary induction plate of the motor, applying alternating current with preset voltage and frequency to the input end of the primary winding of the motor, and obtaining the effective value of the current, apparent power and active power of the input end of the motor. And finally, according to the test value, calculating each parameter in the T-shaped equivalent circuit of the induction motor.

Description

Parameter testing method of linear induction motor in static state
Technical Field
The invention relates to the field of motor testing, in particular to a parameter testing method of a linear induction motor in a static state.
Background
Because of no wheel rail contact, the vibration is little, the travelling comfort is better, the maglev train does not rub with the rail when running, and the noise is lower. The magnetic levitation train has the advantages of rapidness, low consumption, environmental protection, safety and the like, so the magnetic levitation train has very broad prospect. The linear induction motor is the core power of the middle-low speed maglev train, so that the accurate parameters of the linear induction motor are obtained to directly relate to the running stability of the middle-low speed maglev train. The existing motor parameter experiment acquisition method is composed of an open circuit and short circuit test method, so as to obtain the exciting resistance in the T-shaped equivalent circuit of the induction motor
Figure SMS_1
Exciting reactance->
Figure SMS_2
Secondary leakage inductance->
Figure SMS_3
Secondary resistance->
Figure SMS_4
The open circuit test method is easier to develop in a rotary induction motor, however, the open circuit test of a linear induction motor requires a long track and a large space for an experimental device platform, as shown in fig. 1. Therefore, the open circuit test experiment is difficult to develop on the linear induction motor.
Disclosure of Invention
In order to solve the technical problems, the invention provides a parameter testing method of a linear induction motor, which is a method for testing parameters of the linear induction motor in a static state. Firstly, taking out an induction plate of a motor secondary, applying alternating current with preset voltage and frequency to an input end of a motor primary winding, and obtaining a current effective value, apparent power and active power of the input end of the motor. And then, restoring the structure of the secondary induction plate of the motor, applying alternating current with preset voltage and frequency to the input end of the primary winding of the motor, and obtaining the effective value of the current, apparent power and active power of the input end of the motor. And finally, according to the test value, calculating each parameter in the T-shaped equivalent circuit of the induction motor. The motor rotor is in a static state and is suitable for a short primary linear induction motor and a long primary linear induction motor.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a parameter testing method of a linear induction motor in a static state comprises the following steps:
the first step, the induction plate of the motor secondary as the conducting layer is taken out, the secondary iron yoke as the conducting layer is reserved, and the preset voltage is applied to the input end of the motor primary winding
Figure SMS_5
And frequency->
Figure SMS_6
And measuring the phase current effective value +.>
Figure SMS_7
Three-phase active power->
Figure SMS_8
The method comprises the steps of carrying out a first treatment on the surface of the Primary resistance->
Figure SMS_9
And series excitation resistance->
Figure SMS_10
The relation of (2) is:
Figure SMS_11
（1）
wherein the power factor in the state of taking out the conductive layer
Figure SMS_12
The method comprises the following steps:
Figure SMS_13
（2）/>
wherein ,
Figure SMS_14
for the number of phases of the primary winding, +.>
Figure SMS_15
To take out the power factor angle of the conductive layer;
primary leakage reactance
Figure SMS_16
And series excitation reactance->
Figure SMS_17
The relation of (2) is:
Figure SMS_18
（3）
in parallel excitation branches, core loss current
Figure SMS_19
And excitation current->
Figure SMS_20
The expression of (2) is:
Figure SMS_21
（4）
primary core loss power
Figure SMS_22
The method comprises the following steps:
Figure SMS_23
（5）
wherein ,
Figure SMS_24
the phase direct current resistance value of the primary winding;
in the excitation branch, an excitation resistor is connected in series
Figure SMS_25
Parallel excitation resistor->
Figure SMS_26
With primary core loss->
Figure SMS_27
The relation of (2) is:
Figure SMS_28
（6）
primary resistance
Figure SMS_29
Expressed as:
Figure SMS_30
（7）
series excitation reactance
Figure SMS_31
Approximately equal to parallel excitation reactance->
Figure SMS_32
When->
Figure SMS_33
In the case of known, primary leakage reactance
Figure SMS_34
The method comprises the following steps:
Figure SMS_35
（8）
secondly, restoring a secondary induction plate of the motor, and performing a locked rotor experiment of the linear induction motor; applying a preset voltage to the input end of the primary winding of the motor
Figure SMS_36
And frequency->
Figure SMS_37
And (2) alternating current ofMeasuring the phase current effective value +.>
Figure SMS_38
Three-phase active power->
Figure SMS_39
；
Total equivalent resistance of exciting branch and secondary branch
Figure SMS_40
Reactance->
Figure SMS_41
The method comprises the following steps:
Figure SMS_42
（9）
Figure SMS_43
（10）
wherein ,
Figure SMS_44
for the power factor angle in the motor locked-rotor state, < >>
Figure SMS_45
The power factor is the power factor of the motor in the locked state; />
Power factor of motor in locked-rotor state
Figure SMS_46
The method comprises the following steps:
Figure SMS_47
（11）
the series excitation resistance calculated in the first step
Figure SMS_48
Series excitation reactance->
Figure SMS_49
Obtaining a secondary branchResistance in the way->
Figure SMS_50
Reactance->
Figure SMS_51
：
Figure SMS_52
（12）
Figure SMS_53
（13）。
The beneficial effects are that:
aiming at the problem that the open circuit test experiment is difficult to develop on the linear induction motor, the method adopts an experimental test method of a primary and secondary static state to acquire all parameters of the motor, and avoids the requirement of the traditional open circuit test on the secondary length of the linear motor.
Drawings
FIG. 1 is a diagram of a T-type equivalent circuit of an induction motor;
fig. 2 is a series-parallel conversion diagram of the excitation branch at the time of secondary open circuit.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the T-type equivalent circuit of the induction motor employed in the present invention includes: primary resistance
Figure SMS_54
And primary leakage reactance
Figure SMS_55
After the two are connected in series, two parallel branches are connected, namely excitationA magnetic branch and a secondary branch; the excitation branch is formed by an excitation resistor +.>
Figure SMS_56
And excitation reactance->
Figure SMS_57
Formed in series, said secondary branch is formed by a secondary resistor +.>
Figure SMS_58
And secondary reactance->
Figure SMS_59
And the two are connected in series.
The invention relates to a parameter testing method of a linear induction motor, which is a method for testing parameters of the linear induction motor in a static state and comprises the following steps:
first, as shown in FIG. 1, the induction plate (i.e. conductive layer) of the motor secondary is taken out, the secondary yoke (i.e. conductive layer) is reserved, and a preset voltage is applied to the input end of the motor primary winding
Figure SMS_60
And frequency->
Figure SMS_61
And measuring the phase current effective value +.>
Figure SMS_62
Three-phase active power->
Figure SMS_63
. Primary resistance->
Figure SMS_64
And series excitation resistance->
Figure SMS_65
The relation of (2) is:
Figure SMS_66
（1）
wherein the power factor in the state of taking out the conductive layer
Figure SMS_67
The method comprises the following steps: />
Figure SMS_68
（2）
wherein ,
Figure SMS_69
for the number of phases of the primary winding, +.>
Figure SMS_70
To take out the power factor angle in the conductive layer state.
Likewise, primary leakage reactance
Figure SMS_71
And series excitation reactance->
Figure SMS_72
The relation of (2) is:
Figure SMS_73
（3）
as shown in fig. 2, in the parallel excitation branch, the core loss current
Figure SMS_74
And excitation current->
Figure SMS_75
The expression of (2) is:
Figure SMS_76
（4）
the primary core loss power is:
Figure SMS_77
（5）
wherein ,
Figure SMS_78
the coefficient 0.5 is an empirical value considering the secondary yoke, and can be adjusted according to the actual duty ratio of the secondary yoke core loss.
As shown in fig. 2, the shunt reactance
Figure SMS_79
Parallel excitation resistor->
Figure SMS_80
Parallel-to-series replacement excitation resistor->
Figure SMS_81
And excitation reactance->
Figure SMS_82
。
In the excitation branch, an excitation resistor is connected in series
Figure SMS_83
Parallel excitation resistor->
Figure SMS_84
With primary core loss->
Figure SMS_85
The relation of (2) is:
Figure SMS_86
（6）
primary resistance
Figure SMS_87
Can be expressed as:
Figure SMS_88
（7）
primary leakage reactance
Figure SMS_89
Are generally difficult to directly measure, can be passed throughThe over-calculation method is indirectly obtained. In the engineering aspect, the method comprises the steps of,
Figure SMS_90
(parallel excitation reactance) (-)>
Figure SMS_91
) Therefore, series excitation reactance->
Figure SMS_92
Approximately equal to parallel excitation reactance->
Figure SMS_93
. Thus, when->
Figure SMS_94
In the case of known primary leakage reactance +.>
Figure SMS_95
The method comprises the following steps:
Figure SMS_96
（8）
and secondly, recovering the induction plate of the secondary side of the motor, and performing a locked rotor experiment of the linear induction motor. Applying a preset voltage to the input end of the primary winding of the motor
Figure SMS_97
And frequency->
Figure SMS_98
And measuring the phase current effective value +.>
Figure SMS_99
Three-phase active power->
Figure SMS_100
。
Because the air gap of the linear motor is larger, the current in the excitation branch is larger than the current in the rotary motor. The parameters of the excitation branch cannot be ignored in the locked rotor experiment, so the total equivalent resistance of the excitation branch and the secondary branch
Figure SMS_101
Reactance->
Figure SMS_102
The method comprises the following steps: />
Figure SMS_103
（9）
Figure SMS_104
（10）
wherein ,
Figure SMS_105
for the power factor angle in the motor locked-rotor state, < >>
Figure SMS_106
Is the power factor of the motor in the locked state.
Wherein, the power factor of the motor in the locked state
Figure SMS_107
The method comprises the following steps:
Figure SMS_108
（11）
the series excitation resistance calculated in the first step
Figure SMS_109
Series excitation reactance->
Figure SMS_110
The resistance in the secondary branch can be obtained>
Figure SMS_111
Reactance->
Figure SMS_112
：
Figure SMS_113
（12）
Figure SMS_114
（13）
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (1)

1. The parameter testing method of the linear induction motor in the static state is characterized by comprising the following steps of:
the first step, the induction plate of the motor secondary as the conducting layer is taken out, the secondary iron yoke as the conducting layer is reserved, and the preset voltage is applied to the input end of the motor primary winding
Figure QLYQS_1
And frequency->
Figure QLYQS_2
And measuring the phase current effective value +.>
Figure QLYQS_3
Three-phase active power->
Figure QLYQS_4
The method comprises the steps of carrying out a first treatment on the surface of the Primary resistance->
Figure QLYQS_5
And series excitation resistance->
Figure QLYQS_6
The relation of (2) is:
Figure QLYQS_7
（1）
wherein the power factor in the state of taking out the conductive layer
Figure QLYQS_8
The method comprises the following steps:
Figure QLYQS_9
（2）
wherein ,
Figure QLYQS_10
for the number of phases of the primary winding, +.>
Figure QLYQS_11
To take out the power factor angle of the conductive layer;
primary leakage reactance
Figure QLYQS_12
And series excitation reactance->
Figure QLYQS_13
The relation of (2) is:
Figure QLYQS_14
（3）
in parallel excitation branches, core loss current
Figure QLYQS_15
And excitation current->
Figure QLYQS_16
The expression of (2) is:
Figure QLYQS_17
（4）
primary core loss power
Figure QLYQS_18
The method comprises the following steps:
Figure QLYQS_19
（5）
wherein ,
Figure QLYQS_20
the phase direct current resistance value of the primary winding;
in the excitation branch, an excitation resistor is connected in series
Figure QLYQS_21
Parallel excitation resistor->
Figure QLYQS_22
With primary core loss->
Figure QLYQS_23
The relation of (2) is:
Figure QLYQS_24
（6）
primary resistance
Figure QLYQS_25
Expressed as:
Figure QLYQS_26
（7）
series excitation reactance
Figure QLYQS_27
Approximately equal to parallel excitation reactance->
Figure QLYQS_28
When->
Figure QLYQS_29
In the case of known primary leakage reactance +.>
Figure QLYQS_30
The method comprises the following steps:
Figure QLYQS_31
（8）
secondly, restoring a secondary induction plate of the motor, and performing a locked rotor experiment of the linear induction motor; applying a preset voltage to the input end of the primary winding of the motor
Figure QLYQS_32
And frequency->
Figure QLYQS_33
And measuring the phase current effective value +.>
Figure QLYQS_34
Three-phase active power->
Figure QLYQS_35
；/>
Total equivalent resistance of exciting branch and secondary branch
Figure QLYQS_36
Reactance->
Figure QLYQS_37
The method comprises the following steps:
Figure QLYQS_38
（9）
Figure QLYQS_39
（10）
wherein ,
Figure QLYQS_40
for the power factor angle in the motor locked-rotor state, < >>
Figure QLYQS_41
The power factor is the power factor of the motor in the locked state;
power factor of motor in locked-rotor state
Figure QLYQS_42
The method comprises the following steps:
Figure QLYQS_43
（11）
the series excitation resistance calculated in the first step
Figure QLYQS_44
Series excitation reactance->
Figure QLYQS_45
Obtaining the resistance in the secondary branch>
Figure QLYQS_46
Reactance->
Figure QLYQS_47
：
Figure QLYQS_48
（12）
Figure QLYQS_49
（13）。/>
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116520144A (en) * 2023-07-04 2023-08-01 中国科学院电工研究所 Solid rotor induction motor rotor parameter testing method

Citations (5)

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Publication number Priority date Publication date Assignee Title
WO2008064545A1 (en) * 2006-11-28 2008-06-05 Zhuzh Csr Times Electric Co., Ltd. Control method of a linear induction motor
CN109412483A (en) * 2018-10-23 2019-03-01 深圳市深信创联智能科技有限责任公司 The off-line parameter identification method of line inductance electromotor
CN111257749A (en) * 2018-11-30 2020-06-09 华中科技大学 Offline measurement method for parameters of linear induction motor
CN113589165A (en) * 2021-07-14 2021-11-02 中车大连电力牵引研发中心有限公司 Offline measurement method for parameters of linear induction motor
CN113965124A (en) * 2021-10-12 2022-01-21 中国科学院电工研究所 Parameter calculation method of linear induction motor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008064545A1 (en) * 2006-11-28 2008-06-05 Zhuzh Csr Times Electric Co., Ltd. Control method of a linear induction motor
CN109412483A (en) * 2018-10-23 2019-03-01 深圳市深信创联智能科技有限责任公司 The off-line parameter identification method of line inductance electromotor
CN111257749A (en) * 2018-11-30 2020-06-09 华中科技大学 Offline measurement method for parameters of linear induction motor
CN113589165A (en) * 2021-07-14 2021-11-02 中车大连电力牵引研发中心有限公司 Offline measurement method for parameters of linear induction motor
CN113965124A (en) * 2021-10-12 2022-01-21 中国科学院电工研究所 Parameter calculation method of linear induction motor

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116520144A (en) * 2023-07-04 2023-08-01 中国科学院电工研究所 Solid rotor induction motor rotor parameter testing method
CN116520144B (en) * 2023-07-04 2023-08-29 中国科学院电工研究所 Solid rotor induction motor rotor parameter testing method

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